There is a "workaround": When I move an all day event in Thunderbird's month view to another day, it brings up another "shadow" symbol of the courser during moving that disappears when the date is dropped and then also the "double" courser icon is gone!
There is a "workaround": When I move an all day event in Thunderbird's month view to another day, it brings up another "shadow" symbol of the courser during moving that disappears when the date is dropped and then also the "double" courser icon is gone!